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@dancing james
2 weeks ago I was replacing the sealant in my 29er wheels, they had not been used for almost 2 years. I noticed on the bottle of Stans sealant it suggests the sealant is replaced every 3 months.
Commuto x bike was last used on Wednesday in torrential rain. Today I pumped up the tyres and left the house, by the end of the road I was hearing a tchuk tchuk noise I stopped to discover sealant spurting out of the rear tyre, the noise had been it hitting the mudguard once a revolution. Was in a hurry so walked the bike home, by which point the tyre was flat and all the sealant had leaked out. So I just refilled the tyre with sealant, span it round and pumped it up. It held and I rushed off, was now running a little late for work.
1 mile from my destination and I kept hearing a tschh tschh noise, and with each revolution of my front wheel there was a cloud of sealant spraying out. Clearly the front and rear tyres sealant had lost efficacy on the same day.
The air loss was slow enough that I could make it to where I was going and then remove the wheel. Not having more sealant I had to remove the valve and install a tyre. This was actually really easy. However I did spot about 25 bits of flint in the tyre and had to remove all of them before putting the tube in, in case any of the bits of flint was likely to puncture the inner tube. I have a feeling if I had been using inner tubes I'd have had a hell of a lot more punctures by now. 4.5 months on a bike that does on average about 120-150 miles a week with no punctures is pretty good. However I don think I ought to put a reminder in my diary once every four months to replace sealant in all my bikes that are tubeless.